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Topic: Archimedean screw

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Archimedes screw

Screw

Simple machine

Archimedes

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	Historical Background on Screw Threads
		One of the first applications of the screw principle was in presses for the extraction of oils from olives and juice from grapes.
		Screws with fine pitches are essential in a wide variety of instruments - such as micrometers.
		Screw threads for fasteners were cut by hand but increasing demands deemed it necessary from them to be factory made.
	www.boltscience.com /pages/screw2.htm (518 words)

	Rolling Ball Technology - Archimedean Screw
		The device described here is generally termed the "Archimedean" screw, after its presumed inventor, Archimedes of Syracuse.
		It's use for raising balls may be traced to at least the 18th century; a beautiful Archimedean Screw demonstration apparatus is preserved as a part of the King George III Collection of scientific instruments at The Science Museum, London, and is illustrated in Morton and Wess' Public and Private Science.
		Two devices very similar to the Archimedean Screw are the "Caged Screw" and the "Pressurized Screw"
	www.marcdatabase.com /~lemur/rbt-archscrew.html (344 words)

	Production and commerce ecological boilers
		Combustion is carried out by means of a mechanical burner with Archimedean screw (or double Archimedean screw) connected to a container with a bearing capacity of 100 kg.
		The hearth is made with modular foundry cast iron pieces which once assembled create a ring with chambers communicating with the air diversion pipes coming from the centrifuge electric fan located outside the burner.
		The Archimedean screw is made of AISI 304 stainless steel.
	www.termomeccanicapisani.it /en/Boilers.htm (482 words)

	Archimedes' Screw (Sources)
		A theory is sought for the rising of water by the screw of Archimedes.
		There is also the method of the screw, which raises a great quantity of water, but does not carry it as high as does the wheel.
		To the right and left of the screw are beams, with crosspieces fastening them together at both ends.
	www.mcs.drexel.edu /~crorres/Archimedes/Screw/SourcesScrew.html (695 words)

	Archimedes' screw - Encyclopedia, History, Geography and Biography
		The interface between the screw and the pipe does not need to be perfectly water-tight because of the relatively large amount of water being scooped at each turn in respect to the angular speed of the screw.
		A screw could be sealed with pitch or some other adhesive to its casing, or, cast as a single piece in bronze, as some researchers have postulated as being the devices used to irrigate Sennacherib's Hanging Gardens of Babylon.
		Depictions of Greek and Roman water screws show the screws being powered by a human treading on the outer casing to turn the entire apparatus as one piece, which would require that the casing be rigidly attached to the screw.
	www.arikah.com /encyclopedia/Archimedes'_screw (731 words)

	Archimedean screw pumps - Patent 4245949
		According to the present invention an archimedean screw pump comprises a cylinder having an internal helicoidal vane portion and a partial core portion extending from the vane portion, the length of the partial core portion being greater than or equal to the longitudinal distance between adjacent vane portions.
		The modules when assembled together form a screw pump having a screw pump cylinder made out of the said first portions, one or more helicoidal vane portions made out of the second portions of the modules and each helicoidal vane portion having the novel partial core portion extending from it.
		Further details of construction and operation of screw pumps of the type to which the present pumps belong is given in the aforementioned earlier U.S. patent of Chandler.
	www.freepatentsonline.com /4245949.html (1650 words)

	Archimedes' screw at AllExperts
		The interface between the screw and the pipe does not need to be perfectly water-tight because of the relatively large amount of water being scooped at each turn in respect to the angular speed of the screw.
		A screw could be sealed with pitch or some other adhesive to its casing, or, cast as a single piece in bronze, as some researchers have postulated as being the devices used to irrigate Sennacherib's Hanging Gardens of Babylon.
		Depictions of Greek and Roman water screws show the screws being powered by a human treading on the outer casing to turn the entire apparatus as one piece, which would require that the casing be rigidly attached to the screw.
	en.allexperts.com /e/a/ar/archimedes'_screw.htm (577 words)

	Screw Bin Discharger - Guttridge
		Screw Bin Dischargers provide a low cost, versatile bulk bin discharge facility with many applications in the bulk material handling and processing industries.
		Based on established Archimedean screw flight principles, our bulk bin discharger design has been continuously developed over many years and is available with options to suit every requirement.
		Guttridge Screw Bin Dischargers are in operation in many different industry sectors and countries handling a huge variety of bulk solids materials.
	www.guttridge.co.uk /bin_dischargers.php (342 words)

	Food mixer incorporating an archimedean screw and cutting blades - Patent 5727742
		Removably located in the sleeve 20 is an helical impeller 25 which may be in the form of an Archimedean screw with a continuous flight and which is adapted to pass into the sleeve and to be received in the drive assembly 23 therein.
		Whilst it is preferred that the impeller is in the form of an Archimedean screw, and I believe that this is the most efficient form, other impeller forms could be used.
		The impeller 60, which is an Archimedean screw is adapted to pass within the sleeve 46 and to engage with the drive assembly 48 whereby it can be driven.
	www.freepatentsonline.com /5727742.html (1955 words)

	[No title]
		As the material reaches the needle hub (the area between the end of the screw and the needle shaft), it encounters resistance to flow due to the restriction in area at the needle shaft.
		The transporting mechanism is similar to a nut held in a wrench with the screw rotating in the nut.
		Normally, the screw advances in the nut, but when the screw is physically prevented from advancing, as in the case of the Archimedes screw, the nut will slide in the wrench.
	www.lycos.com /info/archimedes--archimedes-screw.html (698 words)

	Archimedes' screw - Engineering (Site not responding. Last check: 2007-10-28)
		Archimedes' screw, or the Archimedean screw, is a simple machine historically used for transferring water from a low-lying body of water into irrigation ditches.
		The lower end of the device is put in the water, and the screw is then turned (usually by a windmill or by animal or human labor).
		Also, water leaking from the top section of the screw leaks into the previous one and so on, so a sort of equilibrium is achieved while using the machine, thus reducing the decrease in efficiency.
	engineering.wikia.com /wiki/Archimedes'_screw (421 words)

	Screw Pumps by Lakeside Equipment Corporation
		Lakeside Screw Pumps are an efficient means of lifting large quantities of water or wastewater at low heads.
		Lakeside's screw pumps, which are patterned after the Archimedian screw, consist of a tube with spiral flights set in an inclined trough.
		Screw lift pumps, archemedes, archimedean screw, archimedes screw, open screw pumps, closed screw pumps, Archimedean screw pumps, Lakeside Equipment Corporation, tube pumps, storm water pumping, wastewater pumps, return sludge pumps, sewage lift pumps, screws, screw covers, lift, sewage, pump station, non clog pumps
	www.enquip.com /Screws.htm (473 words)

	Archimedean Screw Pump or several Archimedean Screw Pumps of excellent quality.
		Screw pumps are generally made of normal mild steel with a special epoxy coating.
		The screw pump is suspended from the upper bearing.
		To absorb shock-load and torque during startup and operation, a heavy duty flexible coupling is used between the drive shaft of the screw pump and the output shaft of the gearbox.
	www.spaansbabcock.com /eng/htmls/screw_pumps_components.php (731 words)

	Screw \| World of Invention
		The discovery of the screw is usually credited to Archimedes, who used an enclosed screw or auger to lift and move water.
		In the thirteenth century, screw hoists were being used to raise loads, and towards the end of the 1400s screw jacks were used to lift wagon wheels for repairs.
		Screw propulsion systems for boats and ships began appearing in the late 1700s, but did not become commonplace until 1838 when Swedish engineer John Ericsson successfully demonstrated propellers on a small ship named Archimedes.
	www.bookrags.com /research/screw-woi (347 words)

	Archimedean - Mower Of The Month
		The name of the mower comes from the shape of the cutting cylinder, which is like an Archimedean screw in being spiral or helical in profile.
		On the Archimedean, for example, a T shaped handle was used that could move freely up and down so that the cross piece was always at a convenient height for the user whatever the aspect of the mower.
		Another oddity of the Archimedean's design was the use of small skids at the front of the mower instead of wheels.
	www.oldlawnmowerclub.co.uk /moms/mom57-arch.htm (588 words)

	Experimentarium • Photo collection by Th.Schiöler • Spiral scoops, screws and the chain pump • The ... (Site not responding. Last check: 2007-10-28)
		This screw was made by a Danish aid organization, which wanted to introduce a well-known technology into Bangladesh.
		Unfortunately, the screw is not inclined at about thirty degrees as it must be to lift any water.
		A screw like this is constructed for draining a large area of reclamation.
	www.experimentarium.dk /uk/naturvidenskab_og_teknik/schiolers/arkimedesskruer.html (230 words)

	Math Online Q and A: The Archimedean screw (also called the Archimedean
		The Archimedean screw (also called the Archimedean snail) is a water raising device used since antiquity to raise water from a river for irragation.
		The device consists of a wooden screw inclosed within a cylinder, and when the cylinder is turned the screw raises the water.
		Consequently, the length of the cylinder containing the Archemedian Screw is the length of the hypotenuse of the right triangle.
	www.mathonline.org /mho/view.cgi?14693 (217 words)

	PA - Wastewater Screw Pumps - water screw pumps,Archimedes screw pump water,solids liquid separation ...
		The dramatically decreasing demand for large Archimedean Water Screw Pumps in the industrialised countries made SPECO® now focus on similar technologies, such as screening and compacting.
		Archimedean Water Screw Pumps are a special type of volumetric pump, able to satisfy users’ requirements as regards favourable investment and running costs, flexibility and reliability.
		PA Archimedean Screw Pumps are used in wastewater treatment, in drainage and irrigation applications, in the food packaging industry, and generally whenever water (even if containing suspended solids) has to be lifted.
	www.wameng.com /Solids_Liquid_Separation_Equipment/PA_Wastewater_Screw_Pumps.html (286 words)

	Archimedean screw - Encyclopedia.com (Site not responding. Last check: 2007-10-28)
		[or Archimedes' screw] Machine for raising water, said to have been invented by Archimedes for removing water from the hold of a large ship.
		One form consists of a circular pipe enclosing a helix and inclined at an angle of about 45°, with its lower end dipped in the water; rotation of the device lifts the water in the pipe.
		Color mixing in the metering zone of a single screw extruder: numerical simulations and experimental validation.
	www.encyclopedia.com /doc/1B1-355720.html (328 words)

	questions about Archimedes that you didn (Site not responding. Last check: 2007-10-28)
		Without the Archimedean screw, I think that people would have a hard time and it would take a long time trying to raise water with a bucket.
		The Archimedean screw was invented, because the people were having trouble trying to raise a river with buckets of water.
		The fire mirrors and the Archimedean screw were invented because the Greeks were being attacked by the Romans and needed.
	derrel.net /math/archimedes/questions_about_archimedes_that.htm (398 words)

	Spaans Babcock - Products & Applications - Archimedean Screw Pumps - Advantages
		Probably the main and overall advantage of a screw pump is its superb reliability.
		A screw pump 'scoops' the water directly from the surface and does not need a collection sump.
		Screw pumps with typical lifetimes of between 20-40 years are not unusual.
	www.spaansbabcock.com /eng/htmls/screw_pumps_advantages.php (819 words)

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